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    <meta charset="UTF-8">
    <title>Bootstrap Collapse</title>
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        <a class="btn btn-primary" data-toggle="collapse" href="#collapseExample">点击查看</a>
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                hello
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                <div class="page-header"role="tab"id="headingOne">
                    <h4 class="panel-title">
                        <a data-toggle="collapse" data-parent="#accordion"href="#collapseOne">item1</a>
                    </h4>
                </div>
                <div id="collapseOne" class="panel-collapse collapse " role="tabpanel">
                    <div class="panel-body">
                        wsetryuiop[xcbnk,
                        wsetryuiop[xcbnk,
                        wsetryuiop[xcbnk,
                    </div>
                </div>
            </div>
            <div class="panel panel-default">
                <div class="page-header"role="tab"id="headingTwo">
                    <h4 class="panel-title">
                        <a data-toggle="collapse" data-parent="#accordion"href="#collapseTwo">item2</a>
                    </h4>
                </div>
                <div id="collapseTwo" class="panel-collapse collapse " role="tabpanel">
                    <div class="panel-body">
                        wsetryuiop[xcbnk,
                        wsetryuiop[xcbnk,
                        wsetryuiop[xcbnk,
                    </div>
                </div>
            </div>
            <div class="panel panel-default">
                <div class="page-header"role="tab"id="headingThree">
                    <h4 class="panel-title">
                        <a data-toggle="collapse" data-parent="#accordion"href="#collapseThree">item3</a>
                    </h4>
                </div>
                <div id="collapseThree" class="panel-collapse collapse " role="tabpanel">
                    <div class="panel-body">
                        wsetryuiop[xcbnk,
                        wsetryuiop[xcbnk,
                        wsetryuiop[xcbnk,
                    </div>
                </div>
            </div>
        </div>
    </div>
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